Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f208767a55c941…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 02:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88acd50f099de34aef83b6bb493ea4ba SHA-1: 4cf75ed853f8d8098ef5a054db31c8d0693351b3 SHA-256: c5f208767a55c9413c1e54bb4050997a91dc3b2f37d56b9bea772a3bf96e1f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm. Heuristics indicate these links are intended to direct users to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=antologia+de+cuentos+clasicos+juveniles+pdf PDF link annotation
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/90432323890.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/wesababovutonozulibabeb.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/divm0meml80r747lsa544pm27u/24419814932.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/80388662237.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608323812f5fb---9644519681.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/pulirisu.pdfIn PDF document text
    • https://majubesar.net/contents//files/99892326826.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df92b6f15d---67127327305.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/lozejajopobo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8789978569b0f45c7fb7bf728aa04212/95624611409.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/61011340595.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/ecbea3775c0c4ed4e1a2faf3e7ca2115/29004943912.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b19656ac881eeeb7286d5703a9e17a98/99535399041.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/bokejogilojariroratudeb.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf78cad00---4543371452.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/84518492915.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/mugavulerixifenuvuvagaw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/46b497t0qtc8d2gb890p310k76/fibafatiseruxovezitojebop.pdfIn PDF document text
    • http://juha.be/_files/file/tobefagujokomosujavigi.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/83647103568.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114556e46bab---41423422492.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E2 19080 bytes
SHA-256: f51274785f5de97e80d630bf44208baf187f10f8b7766a9e5ee6332422064c0b
font_01_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 10972 bytes
SHA-256: f578b46eeb76738542e50393d747b05fac1a0ab9cdfbea0e2252e1c466c40982

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